feat(03-02): tablo handlers + router wiring — list/new/create green
- Implement TablosListHandler, TablosNewHandler, TablosCreateHandler in
handlers_tablos.go replacing the Plan 01 stub
- TablosCreateHandler: reads via r.PostFormValue, validates title (required,
<=255), inserts with pgtype.Text nullable params, sends HX-Retarget +
HX-Reswap on HTMX success, 303 redirect on non-HTMX success
- router.go: replace r.Get("/", IndexHandler()) with TablosListHandler;
add GET /tablos/new and POST /tablos (static before parametric — Pitfall 1)
- handlers.go: remove IndexHandler + unused auth/csrf imports
- index.templ: reduced to bare package declaration (dashboard moved to tablos.templ)
- index_templ.go: deleted (empty templ file generates broken import)
- TestTabloList, TestTabloList_Empty, TestTabloCreate, TestTabloCreate_Validation: PASS
- TestSignup, TestLogin, TestLogout, TestCSRF: still PASS (no regression)
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